CLHS: Section 19.2.2.2.1

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## 19.2.2.2.1 NIL as a Component Value

As a pathname component value, nilrepresents that the component is ``unfilled''; see Section 19.2.3 (Merging Pathnames).

The value of any pathname component can be nil.

When constructing a pathname, nil in the host component might mean a default host rather than an actual nil in some implementations.

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